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This commit is contained in:
Edward Emelianov
2025-09-20 23:26:46 +03:00
parent f3c3bf451b
commit 9b0ee87891
14 changed files with 841 additions and 11 deletions
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16
F3:F303/MLX90640/i2c.c
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@@ -98,10 +98,12 @@ void i2c_setup(i2c_speed_t speed){
GPIOB->AFR[0] = (GPIOB->AFR[0] & ~(GPIO_AFRL_AFRL6 | GPIO_AFRL_AFRL7)) |
AFRf(4, 6) | AFRf(4, 7);
GPIOB->MODER = (GPIOB->MODER & ~(GPIO_MODER_MODER6 | GPIO_MODER_MODER7)) |
GPIO_MODER_MODER6_AF | GPIO_MODER_MODER7_AF;
MODER_AF(6) | MODER_AF(7);
GPIOB->PUPDR = (GPIOB->PUPDR & !(GPIO_PUPDR_PUPDR6 | GPIO_PUPDR_PUPDR7)) |
GPIO_PUPDR6_PU | GPIO_PUPDR7_PU; // pullup (what if there's no external pullup?)
GPIOB->OTYPER |= GPIO_OTYPER_OT_6 | GPIO_OTYPER_OT_7; // both open-drain outputs
PUPD_PU(6) | PUPD_PU(7); // pullup (what if there's no external pullup?)
GPIOB->OTYPER |= OTYPER_OD(6) | OTYPER_OD(7); // both open-drain outputs
GPIOB->OSPEEDR = (GPIOB->OSPEEDR & OSPEED_CLR(6) & OSPEED_CLR(7)) |
OSPEED_HI(6) | OSPEED_HI(7);
// I2C (default timing from sys clock - 72MHz)
RCC->APB1ENR |= RCC_APB1ENR_I2C1EN; // clocking
if(speed < I2C_SPEED_400K){ // slow cpeed - common mode
@@ -257,12 +259,12 @@ static uint8_t *i2c_readb(uint8_t addr, uint16_t nbytes){
}
uint8_t *i2c_read(uint8_t addr, uint16_t nbytes){
if(isI2Cbusy() || !waitISRbit(I2C_ISR_BUSY, 0)) return 0;
if(isI2Cbusy() || !waitISRbit(I2C_ISR_BUSY, 0) || nbytes < 1 || nbytes > I2C_BUFSIZE*2) return 0;
return i2c_readb(addr, nbytes);
}
static uint8_t dmard(uint8_t addr, uint16_t nbytes){
if(nbytes < 1 || nbytes > I2C_BUFSIZE) return 0;
if(nbytes < 1 || nbytes > I2C_BUFSIZE*2) return 0;
i2cDMAsetup(0, nbytes);
goterr = 0;
i2c_got_DMA = 0;
@@ -275,14 +277,14 @@ static uint8_t dmard(uint8_t addr, uint16_t nbytes){
}
uint8_t i2c_read_dma16(uint8_t addr, uint16_t nwords){
if(nwords > I2C_BUFSIZE/2) return 0; // what if `nwords` is very large? we should check it
if(nwords > I2C_BUFSIZE) return 0; // what if `nwords` is very large? we should check it
if(isI2Cbusy() || !waitISRbit(I2C_ISR_BUSY, 0)) return 0;
return dmard(addr, nwords<<1);
}
// read 16bit register reg
uint16_t *i2c_read_reg16(uint8_t addr, uint16_t reg16, uint16_t nwords, uint8_t isdma){
if(isI2Cbusy() || !waitISRbit(I2C_ISR_BUSY, 0) || nwords < 1 || nwords > I2C_BUFSIZE/2) return 0;
if(isI2Cbusy() || !waitISRbit(I2C_ISR_BUSY, 0) || nwords < 1 || nwords > I2C_BUFSIZE) return 0;
reg16 = __REV16(reg16);
if(!i2c_writes(addr, (uint8_t*)&reg16, 2, 0)) return NULL;
if(isdma){