342 lines
8.9 KiB
C
342 lines
8.9 KiB
C
#include "asm/iic_hw.h"
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#include "system/generic/gpio.h"
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#include "system/generic/log.h"
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#include "asm/clock.h"
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#include "asm/cpu.h"
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#if 0
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/*
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[[ 注意!!! ]]
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* 适用于带cfg_done的硬件IIC，另一种硬件IIC另作说明
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* 硬件IIC的START / ACK(NACK)必须在发送或接收字节cfg_done前设置，且不能
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接cfg_done单独发送；而STOP则应在发送或接收字节cfg_done后设置，必须接
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cfg_done单独发送
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*/
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/* const struct hw_iic_config hw_iic_cfg_test[] = { */
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/* //iic0 data */
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/* { */
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/* // SCL SDA */
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/* .port = {IO_PORTA_06, IO_PORTA_07}, */
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/* .baudrate = 100000, //IIC通讯波特率 */
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/* .hdrive = 0, //是否打开IO口强驱 */
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/* .io_filter = 1, //是否打开滤波器（去纹波） */
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/* .io_pu = 1, //是否打开上拉电阻，如果外部电路没有焊接上拉电阻需要置1 */
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/* .role = IIC_MASTER, */
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/* }, */
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/* }; */
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static JL_IIC_TypeDef *const iic_regs[IIC_HW_NUM] = {
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JL_IIC,
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};
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#define iic_get_id(iic) (iic)
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#define iic_info_port(iic, x) (hw_iic_cfg[iic_get_id(iic)].port[x])
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#define iic_info_baud(iic) (hw_iic_cfg[iic_get_id(iic)].baudrate)
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#define iic_info_hdrive(iic) (hw_iic_cfg[iic_get_id(iic)].hdrive)
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#define iic_info_io_filt(iic) (hw_iic_cfg[iic_get_id(iic)].io_filter)
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#define iic_info_io_pu(iic) (hw_iic_cfg[iic_get_id(iic)].io_pu)
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#define iic_info_role(iic) (hw_iic_cfg[iic_get_id(iic)].role)
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static inline u32 iic_get_scl(hw_iic_dev iic)
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{
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u8 port = iic_info_port(iic, 0);
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return port;
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}
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static inline u32 iic_get_sda(hw_iic_dev iic)
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{
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u8 port = iic_info_port(iic, 1);
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return port;
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}
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static int iic_port_init(hw_iic_dev iic)
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{
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u32 reg;
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int ret = 0;
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u8 id = iic_get_id(iic);
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u32 scl, sda;
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scl = iic_get_scl(iic);
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sda = iic_get_sda(iic);
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if (id == 0) {
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gpio_set_fun_output_port(scl, FO_IIC_SCL, 1, 1);
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gpio_set_fun_output_port(sda, FO_IIC_SDA, 1, 1);
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gpio_set_fun_input_port(scl, PFI_IIC_SCL);
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gpio_set_fun_input_port(sda, PFI_IIC_SDA);
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if (scl >= IO_PORT_DP || sda >= IO_PORT_DP) {
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usb_iomode(1);
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}
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if (iic_info_hdrive(iic)) {
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gpio_set_hd(scl, 1);
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gpio_set_hd(sda, 1);
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} else {
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gpio_set_hd(scl, 0);
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gpio_set_hd(sda, 0);
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}
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if (iic_info_io_pu(iic)) {
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gpio_set_pull_up(scl, 1);
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gpio_set_pull_down(scl, 0);
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gpio_set_pull_up(sda, 1);
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gpio_set_pull_down(sda, 0);
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} else {
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gpio_set_pull_up(scl, 0);
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gpio_set_pull_down(scl, 0);
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gpio_set_pull_up(sda, 0);
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gpio_set_pull_down(sda, 0);
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}
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} else {
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ret = -EINVAL;
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}
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return ret;
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}
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int hw_iic_set_baud(hw_iic_dev iic, u32 baud)
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{
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//f_iic = f_sys / (IIC_BAUD * 2)
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//=> IIC_BAUD = f_sys / (2 * f_iic)
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u32 sysclk;
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u8 id = iic_get_id(iic);
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sysclk = clk_get("lsb");
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/* printf("lsb clk:%d",sysclk); */
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if (sysclk < 2 * baud) {
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return -EINVAL;
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}
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iic_baud_reg(iic_regs[id]) = sysclk / (2 * baud);
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return 0;
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}
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static void hw_iic_set_die(hw_iic_dev iic, u8 en)
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{
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u8 id = iic_get_id(iic);
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u32 scl, sda;
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scl = iic_get_scl(iic);
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sda = iic_get_sda(iic);
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if (id == 0) {
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gpio_set_die(scl, en);
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gpio_set_die(sda, en);
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} else {
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//undefined
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}
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}
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void hw_iic_suspend(hw_iic_dev iic)
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{
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hw_iic_set_die(iic, 0);
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}
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void hw_iic_resume(hw_iic_dev iic)
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{
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hw_iic_set_die(iic, 1);
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}
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int hw_iic_init(hw_iic_dev iic)
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{
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int ret;
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u8 id = iic_get_id(iic);
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if ((ret = iic_port_init(iic))) {
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printf("invalid hardware iic port\n");
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return ret;
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}
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hw_iic_set_die(iic, 1);
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if (iic_info_role(iic) == IIC_MASTER) {
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iic_host_mode(iic_regs[id]);
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if ((ret = hw_iic_set_baud(iic, iic_info_baud(iic)))) {
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printf("iic baudrate is invalid\n");
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return ret ;
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}
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} else {
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iic_slave_mode(iic_regs[id]);
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iic_slave_scl_pull_down_enble(iic_regs[id]); //在收到/在发送数据时把SCL拉低
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iic_dir_in(iic_regs[id]);
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}
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if (iic_info_io_filt(iic)) {
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iic_isel_filter(iic_regs[id]);
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} else {
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iic_isel_direct(iic_regs[id]);
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}
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iic_auto_ack(iic_regs[id]);
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iic_int_disable(iic_regs[id]);
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iic_pnding_clr(iic_regs[id]);
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iic_enable(iic_regs[id]);
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/* iic_disable(iic_regs[id]); */
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#if 0
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printf("info->scl = %d\n", iic_get_scl(iic));
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printf("info->sda = %d\n", iic_get_sda(iic));
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printf("info->baudrate = %d\n", iic_info_baud(iic));
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printf("info->hdrive = %d\n", iic_info_hdrive(iic));
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printf("info->io_filter = %d\n", iic_info_io_filt(iic));
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printf("info->io_pu = %d\n", iic_info_io_pu(iic));
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printf("info->role = %d\n", iic_info_role(iic));
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printf("IIC_CON0 0x%04x\n", iic_regs[id]->CON0);
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printf("IIC_CON1 0x%04x\n", iic_regs[id]->CON1);
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printf("IIC_BAUD 0x%02x\n", iic_regs[id]->BAUD);
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//printf("IIC_BUF %02x\n", iic_regs[id]->BUF);
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printf("IOMC1 0x%08x\n", JL_IOMAP->CON1);
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#endif
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return 0;
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}
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void hw_iic_uninit(hw_iic_dev iic)
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{
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u8 id = iic_get_id(iic);
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u32 scl, sda;
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scl = iic_get_scl(iic);
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sda = iic_get_sda(iic);
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hw_iic_set_die(iic, 0);
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if (id == 0) {
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gpio_set_hd(scl, 0);
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gpio_set_hd(sda, 0);
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gpio_set_pull_up(scl, 0);
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gpio_set_pull_up(sda, 0);
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if (scl >= IO_PORT_DP || sda >= IO_PORT_DP) {
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usb_iomode(0);
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}
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}
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iic_disable(iic_regs[id]);
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}
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//必要的延时,两次通信之间至少20us
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static u8 start_signal = 0;
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static u8 end_signal = 0;
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void hw_iic_start(hw_iic_dev iic)
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{
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u8 id = iic_get_id(iic);
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/* iic_enable(iic_regs[id]); */
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start_signal |= BIT(7);
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start_signal++;
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if ((start_signal & 0x7f) == 2) {
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start_signal &= ~BIT(7);
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}
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}
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//必要的延时,两次通信之间至少20us
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void hw_iic_stop(hw_iic_dev iic)
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{
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u8 id = iic_get_id(iic);
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/* iic_disable(iic_regs[id]); */
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iic_host_send_stop(iic_regs[id]); //stop singal
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start_signal = 0;
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while (!iic_host_is_stop_pending(iic_regs[id]));
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}
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u8 hw_iic_tx_byte(hw_iic_dev iic, u8 byte)
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{
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u8 ack = 0;
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u8 id = iic_get_id(iic);
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iic_dir_out(iic_regs[id]);
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if ((start_signal & 0x7f) >= 2) { //连续两次起始信号则进入发送地址并接收模式
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iic_dir_in(iic_regs[id]);
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iic_host_receive_continue_byte(iic_regs[id]);
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iic_restart(iic_regs[id]);
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/* printf("rst/\n"); */
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}
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iic_buf_reg(iic_regs[id]) = byte;
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if (start_signal & BIT(7)) {
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iic_kick_start(iic_regs[id]); //kick start
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start_signal &= ~BIT(7);
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/* printf("st/\n"); */
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}
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while (!iic_is_pnding(iic_regs[id]));
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if (!iic_host_send_is_ack(iic_regs[id])) {
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ack = 1;
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}
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iic_pnding_clr(iic_regs[id]);
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return ack;
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}
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u8 hw_iic_rx_byte(hw_iic_dev iic, u8 ack)
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{
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u8 data = 0;
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u8 id = iic_get_id(iic);
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iic_dir_in(iic_regs[id]);
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iic_host_receive_continue_byte(iic_regs[id]);
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iic_host_read_kick_start(iic_regs[id]);
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if (ack) {
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} else {
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iic_host_nack_auto_stop(iic_regs[id]); //硬件检测到nack(这个nack是我们硬件发出的), 自动长生stop信号
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iic_host_receive_continue_byte_stop(iic_regs[id]); //最后1byte, 完成后自动nack;
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}
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while (!iic_is_pnding(iic_regs[id]));
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data = iic_buf_reg(iic_regs[id]);
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iic_pnding_clr(iic_regs[id]);
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return data;
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}
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int hw_iic_write_buf(hw_iic_dev iic, const void *buf, int len)
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{
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u8 id = iic_get_id(iic);
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int i = 0;
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if (!buf || !len) {
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return -1;
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}
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iic_dir_out(iic_regs[id]);
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for (i = 0; i < len; i++) {
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iic_buf_reg(iic_regs[id]) = ((u8 *)buf)[i];
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/* if (i == 0) { */
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/* iic_kick_start(iic_regs[id]); //kick start */
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/* } */
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while (!iic_is_pnding(iic_regs[id]));
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if (iic_host_send_is_ack(iic_regs[id])) {
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iic_pnding_clr(iic_regs[id]);
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break;
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}
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iic_pnding_clr(iic_regs[id]);
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}
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return i;
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}
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int hw_iic_read_buf(hw_iic_dev iic, void *buf, int len)
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{
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u8 id = iic_get_id(iic);
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int i;
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if (!buf || !len) {
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return -1;
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}
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iic_dir_in(iic_regs[id]);
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iic_host_receive_continue_byte(iic_regs[id]);
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for (i = 0; i < len; i++) {
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iic_host_read_kick_start(iic_regs[id]);
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if (i == len - 1) {
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iic_host_nack_auto_stop(iic_regs[id]); //硬件检测到nack(这个nack是我们硬件发出的), 自动长生stop信号
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iic_host_receive_continue_byte_stop(iic_regs[id]); //最后1byte, 完成后自动nack;
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}
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while (!iic_is_pnding(iic_regs[id]));
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iic_pnding_clr(iic_regs[id]);
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((u8 *)buf)[i] = iic_buf_reg(iic_regs[id]);
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}
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return len;
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}
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void iic_disable_for_ota()
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{
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JL_IIC->CON0 = 0;
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}
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#endif
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